Non-commutative digital signatures. - Delaram Kahrobaei; Charalambos Koupparis (Groups Complex. Cryptol., 2012)

Public key exchange using matrices over group rings. - Delaram Kahrobaei; Charalambos Koupparis; Vladimir Shpilrain (Groups Complex. Cryptol., 2013)

Public key exchange using semidirect product of (semi)groups. - Maggie E. Habeeb; Delaram Kahrobaei; Charalambos Koupparis; Vladimir Shpilrain (IACR Cryptol. ePrint Arch., 2013)

A CCA secure cryptosystem using matrices over group rings. - Delaram Kahrobaei; Charalambos Koupparis; Vladimir Shpilrain (CoRR, 2014)